Pump for chemical materials



Marh 5, 1940. R. L. NELSON PUMP FOR CHEMICAL MATERIALS 3 Sheets-Sheet 1 l Filed .nine 23. 19:57

March 5, 1940. R. L. NELSON PUMP FOR CHEMICAL MATERIALS Filed June 25. 1957 5 Shevets-Sheet 2 R. l.. NELsoN PUMP FOR CHEMICAL MATERIALS AMarch 5, 1940.

5 Sheets-Sheet 3 fill/e775# Filed June 25, 1937 b 4 mbe/z L/Veom Patented Mar. 5, 1940 .l UNI-TED STATES .TENT OFFICE I 3 Claims.

'I'he present invention relates to pumps for chemical materials.

More vparticularly the present invention relates n to means for pumping materials llikely to have corrosive eiiectsupon metals. The invention will be described in connection with means for vpumping water treatment chemicals into the feed waterlines of'steam boilers. It will be understood, however, as the description proceeds that the invention has-a broader application. Means have been suggested for the purpose referred to,but according to applicants observation these prior devices have not been satisfactory due to the con- `stant maintenance requirements and due tothe loss of chemical material due to leakage. Certain prior devices have involved a pump having a piston, but it has been impossible to keep the piston4 from leakage. Injectors and syphons have been suggested for adding chemicals to other liquids lbut not with much success.

An object of the present invention is to provide improved means Ifor introducing chemical material into vliquids in which meansy the effects of wear and corrosive action may be reduced to A further object is to provide means of the kind immediately above referred to in which the pump-` ing of the chemical may be maintained for pro- A longed periods of time in correct adjusted proportion to the flow of liquid into which the chemical is to be introduced. l

A further object is to provide an improved pump for chemicals having corrosive characteristics which is well adapted to meet the needs'of commercial operatic-n;

Further objects will appear as proceeds. i

Referring to the drawings- Figure 1 is a fragmentary view illustrating an embodiment of the present invention as applied to a feed water pump as commonly encountered According to this figure thev the description (Cl. 10S-50) Figure 6 is a diagrammatic View along the'lines` of Figures 1 and 2 but showing means for pumping fluid in contact with solid chemical substances.`

Referring first to Figure 1, the numeral I0 indicates as a whole a pump for pumping chemicals. Said pump, for purposes of this descrip-y `tion,may be considered to bemade up of three integral parts, thek operating section I I, the pump section l2 and the intermediate packing gland section I3; o

The numeral I4 indicates a water pump oper-- ated through the medium of the piston rod I5 by the steam cylinder I6. The two sides of the water pump I4 have connected thereto the pipes I1 and I8 connected to the two sides ofthe operating section II of the chemical pump lil. It will be understood that as the pressures vary atthe two ends of the water pump I4, corresponding. variations I will be. communicated through the pipes I1 and I8 to the two ends rof rthe operating section I I.

The numeral 2l indicates an inlet pipe for raw water, which pipe 2l connects with the feed water heater 20. Pipe i9 admits water from the feed water heater 20 to the pump I4. The outlet pipe from pump Il!l is not illustrated.

The numeral 22 indicates a tank for supplying chemical material to the pipe' 2l." For this purpose a pipe 23 is provided, which may be called a suction line, leading from the chemical supply tank 22 to the inlet side of the pump section I2 ist of the pump It. A pipe 24, which may be termed a chemical discharge line, connects the outlet side of the pump section I2 to the pipe 2| Referring fnow to Figure 2, a water pump is indicated by the numeral 25, which is operated from the steam cylinders indicated as a whole by the numeral 26. Water is taken into the pump 25 through the pipe 28 and is discharged through the water. line 21. Just as in the structure illustrated in Figure 1, the chemical supply tank 22 has connected thereto the pipes Il and I.` According to the structure shown in Figure 2, said pipes I'I and I8 have pressures therein varying in accordance with the variation in the pressure within one of the steam cylinders 26. According to the structure shown inFigure 2, just as in Figure 1, the chemical supply tank 22 is between the shoulder 34 and the collar 31. The

provided with the suction line 23 leading to the inlet of the pump section II and is also provided with the chemical discharge line 24 connected .to the outlet ofsaid pump section I I. Said chemical discharge line 24 connects with the Water line 28.

Reference may noW be had to Figures 3 and 4 for a description of the details of construction of the chemical pump Ii). As indicated above,`the pump II) may be considered as comprising three sections, the operating section II, the packing gland section I3 and the pumpsection I2. Said sections are connected-end for end to provide a unitary elongated device.

The operating section I I includes a member 29 having the bore 33 for the reception of the piston 3l. The outer extremity of the cylindrical member 29 may be reduced in diameter and may be externally screw-threaded for the reception of 1 floating relationship With the piston rod 35. In

other language, the piston l3I should be vso disposed upon the piston rod 35 as to permit a slight rocking action Without having any considerable play longitudinally of the piston rod 35. The purpose of this* floating relationship Vvvill appear presently. 4Intermediate of the 'shoulder' 34 and the bore 33 is a'portion 36 of materially greater diameter than the diameter of the piston rod 35.

Disposed Within the portion 35 is the collar 3l fitting freely within said ,reduced portion 33 and.`

also-fitting freely upon the piston rod 35. A setscrew 38 limits movement of the collar 31 in a left-'hand direction as the parts are viewed 'in Figure 4.' Packing material 38 is disposed beportion 3B of the operating section I I isprovided with thev threaded aperture 4I) communicatingY With the bore at theregion to the right of the piston 3| as the parts are viewed in Figure 4.x

Said' threaded aperture 40 is adapted to receive a tting for providing juncture With the pipe I'I.`

member' I2 is closed by means of the lend mein'-A ber 45.

:The cylindrical member' 42 adjacent to 'its' right-hand extremity is provided with the threaded aperture 46 for the reception of the chemical suction line 23. For simplicity of :46 is vthe aperture ,48 for receiving the chemical The left-fhand discharge pipe 24. 'I'he aperture 48 maybe provided at its bottom With the valve seat v49 moved out of its biased position it will permit ow of material from the bore 43 to the dischargeline 24. 'f

Referring now to the packing glandsectiogriv I3,

- said section includes themember 5I,v internally. threaded at its ends to receive the correspondingly threaded extremities of the operating section II and th'efpump section I2.

Said member '5 I j e is provided with a greasegun connection 52,

' whereby lubricant may be charged intov the. in-

terior of the packing gland section. I3 Mounted in sliding relationship with the piston rod are the two collars v53and- 54'fada1jitedv'toV ride j Within cylindrical pockets and 56; respectively of the corresponding ends of th'elope'rating section II and the pump'section I2.y Packing material 51 is provided Wthinsaid pockets55 and-56..y Said packing material5'I is adapted tobe com-f.,y pacted by'said collars 53 and 54, and for, this.

urge said collars 53 and 54 apartz-A Inasmuch as 'chemical material is adapted 'toi purpose a coil spring 58 is provided adaptecllto v30'` be admitted through the'suction line 23 and dis-j v charge line 24, said lines, together with the valves 41 and 50 and their cooperating parts including the pump section I2 and the; piston rod 35, will preferably'be made of'material stronglyvresistant to the corrosive action of the chemical being;

pumped.- ,l f y f f "it Figure 5 illustrates means for conveniently ad-k justing the stroke of the'piston 3I. In Figure k5 the port 33 is disposed` in the peripheralip'ortion of the cap 32. Disposed axially of saidv cap 32 is the setscrew 59 extending'into the'interior ofy the cylinder. I I. positionby means of the locknut 60.'

As indicated above, Figure-6 illustrates a con- Said setscrew maybeclked in 'a struction in which Water is'pumped through a.

container containing solidch'emicals whereby tov .dissolve said chemicals and deliver them into a;A ,l

- 6, one side of the water pump.25 is'connected to one endel of .the cylinder.` II through the'pipe I8.-k

The other side of the Water` pump -25 is connected.

to theother vend of said cylinderI I.- C'onnected'V Ato the inlet side of the pump 25 is the suction line II,A and connected tothe outlet side ofthe pump 25 is the discharge line 62, which may leady n to aboiler (not shown). u

The numeral 63 indicates .a container forsolid chemicals. Said container-63 .may bev provided with the false bottom or screen 34- `forfholding' said chemicals aWayfrom the' bottom of the*- container B3. The suction pipe 55 connects thev suction line 6I to the suction` side ofthe cylinder I2` The discharge pipe 66 connects thedischarge side of the cylinder I2 with the upperportion-ot 1 the chemical container 63. The dischargeopi-pe 3'! connects the bottom of the container 64 lwith the pipe BI at a region more closely adjacent :to i. thepump 25th`an is the linetpipe I5.v Ayval've 38'is provided in the pipe 61 for preventing backflow of fluid through the container S3 from the" discharge pipe 61.

bodiments of the presentinvention Will'be clear the left.

without detailed explanation. According to the structure shown in Figure 1, variations in pressure at the two ends of the operating section II of the 'pump I0 are produced in correspondence to the variations in pressure at the two ends of the water pump I4. According to the structure disclosed in` Figure 2, the variations in pressure at the two ends of theoperating section I I are maintained in accordance with variations in pressure at the two ends of one of the ,steam cylinders which operates the water pump. According to the structure disclosed in Figure 6, variations in pressure at the two ends of the operating section Il are maintained in accordance with variations in pressure at the two ends of the pump 25. `In any case the operations of the pump It! are in synchronism with the operations of the water pump whereby chemical will be supplied to the feed water in direct proportion to the operation of the pump which pumps the feed water. According to thersystemy disclosed in Figure 6, water will be ldrawn from the suction line I when the piston rod 35 is drawn to The valve 68 will prevent the suction of fluid into the container 63 at this time. When the piston rod 35 is moved toward the right, water will be delivered through the container 63 in contact with chemicals therein, past the valve 68 into the section linefii forwardly of the inlet pipe 55. Chemical dissolved from the solids in the container 63 will be mixed with the vwater entering the pump 25 and will be forced out through the discharge line 62 to the boiler.

The piston 3l will` be reciprocated within the bore 30 in a manner which will be clear without further explanation; The piston rod 35 will have a bearing within the packing material 551-51. By reason of the floating relationship of the piston 3l with respect to the piston rod 35, the piston rod 35 is free from thrust except in an axial' direction. It will be preferred in practice to make the piston 3| readily separable' from the i piston rod 35, thereby simplifying the job of revsired.

rod 35 is in the packing material 51, the'rodl newing either the rod or the piston .when de- Inasmuch as the only bearing for-the slides freely with a minimum of wear. The packing material 51, being compacted by the spring 5B, is at all times maintained in proper packing relationship with the sliding rod 35 regardless of wear of said packing material. By reason of the lubricant which may be charged into the packing gland section I3 through the connection 52,l the packing material is maintained in.l proper condition.

As the piston rod 35 reciprocates it will draw chemical material through the suction line 23 and discharge this chemical material through the discharge line 24. In other words, when the piston rod 35 is moved to the left as the parts are viewed in Figure 4, a suction will be set up within the bore 43, holding the valve 50 tightly to its seat but causing the opening of the valve l 41 to suck in chemical materialy through the to the present invention does not require a particularly close iit between the piston rod 35 and the bore 43 inasmuch as the constantly compacted material 51 protects the device against passage of chemical tothe left as the parts are viewed in Figure 4. In other words, the pump according to the `present invention requires no duid-tight metal-to-metal bearings in the chemical end of the pump. It will be understood that the invention is applicable for other purposes than that above mentioned, of forcing chemical into feed water and the like. For example, the device may be utilized for pumping lubricant if preferred. Another use to which the device has been put is the prcportioning of chemicals into gasoline during its manufacture. Many other uses will occur to those skilled in the art.

Thoughv certain preferred embodiments of the present invention have been described in detail, many modiiications will occur to those skilled in the art. It is intended to cover all such modifications that fall within the scope of the appended claims.

' What is claimed isl. In a device of the character described, a pump, said pump comprising an operating section, a packing gland section and a pump section all united together, said operating section having a cylinder, a piston within said cylinder, said pump also having a piston rod connected with said piston and packing material comprising a bearing for said piston rod and adapted to have a limited movement along said piston rod, said pump section of said pump also having a chamber the capacity of which is controlled by operation of said piston rod, said chamber having a valved port permitting ingress into said chamber while preventing discharge therefrom and another valved port permitting dischargel from said chamber while preventing ingress thereto, and spring means for constantly urging said packing material to predetermined positions re1- ative to said pump, ysaid packing gland section being adapted to be filled with lubricant enclosing said piston rod.

2. In a device of the character described, a

prising an operating section, a packing gland section and a pump section all united together, said operating section having a cylinder, a piston within said cylinder, said pump also having a piston rod connected with said piston and packing material comprising a bearing for said piston rod and adapted to have a limited movement along said piston rod, said pump section of said pump also having `a chamber the capacity of which is controlled by operation of said piston pump for pumping chemicals, said pump comrod, said chamberhavinga valved port permit- `ting ingress into said chamber while preventing discharge therefrom and another valved port permitting discharge from said chamber While preventing ingress thereto, and spring means for constantly urging said packing material to predetermined positions relative to said pump, part of said packing material being subject to changes in pressure within said operating section, said packing gland section being adapted to be filled with lubricant enclosing said piston rod.

3. In a pump for chemical material, in combination, an operating section including a cylinder having a piston slidable therein, fluid pressure means communicating with the two ends of said cylinder to cause reciprocation of said piston within said cylinder, a packing gland section secured to said operating section, said packing gland section including a pair of packing members adapted to have limited movement alongv said piston rod, spring means between said packing members for exerting a continuous compacting force against said packing members to move said packing members to predetermined positions relative to said pump, said packing members comprising a bearing for said piston rod, and a pump section secured to said packing gland section, said pump section including a cylinder for receiving an extremity of said piston 1nd,'.

said last mentioned `cylinder beingprovided. With a removable inlet Valve assembly and a removable outlet valve assembly, said inlet lvalve ,and outlet valve assemblies being located in the ex- A tremity of said pump section opposite to said operating section 'and closely adjacent to saidvv 

